hibernate映射关系（多对多）

Student与Teacher关系多对多(只建了2个实体类)

 public class Student {
     private int id;
     private String name;
     private Set<Teacher> teachers = new HashSet<Teacher>();
 }

 public class Teacher {
     private int id;
     private String name;
     private Set<Student> students = new HashSet<Student>();
 }

多对多

 <hibernate-mapping package="entity">
     <class name="Student">
         <id name="id">
             <generator class="native"/>
         </id>
         <property name="name"/>
         <!--
             <set>标签的table属性：    配置关系表的名称
             <key>标签的column属性：    当前实体对应数据库表的外键字段名
             <many-to-many>标签表示多对多关系，属性：
                 class属性：    表示对方的类名
                 column属性： 表示对方的表在关系表中的外键字段名
         -->
         <set name="teachers" table="StudentTeacher" cascade="save-update">
             <key column="studentId"/>
             <many-to-many class="Teacher" column="teacherId" />
         </set>
     </class>
 </hibernate-mapping>

 <hibernate-mapping package="entity">
     <class name="Teacher">
         <id name="id">
             <generator class="native"/>
         </id>
         <property name="name"/>
         <set name="students"  table="StudentTeacher" cascade="save-update">
             <key column="teacherId"/>
             <many-to-many class="Student" column="studentId" />
         </set>
     </class>
 </hibernate-mapping>